I haven't officially been to an ENT after my hearing test yet but I'm wondering what could have caused this. I took a few Benadryl before this started and realized they were like 5 years expired so I threw them away and started taking non-expired Benadryl. I also took Tylenol PM once. I've never had a bad reaction to either.. I'm wondering if it's possible taking expired medication could have caused this ringing? I'm also 7.5 months pregnant and under a great deal of stress.. I guess it probably doesn't matter what the cause is.. I'm just feeling pretty low right now as there was a increase in the ringing sound this evening and my anxiety is on overdrive.